As a result, MorphOS on a Mac Mini 1.42GHz plays x.264 720p streams better than a Sam plays DVD streams. A difference in work task that is a magnitude greater than the difference in clock frequency (of course other things affects the results as well, such as bus speed, etc).
Since you are bringing different hardware in for comparison, I see your puny mac mini and raise you my (now not so hot) Q9450 with fully hardware-accelerated video decoding courtesy of nVidia's proprietary X drivers, which handles multiple 1080p streams no sweat at all :lol: